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Nagashima Ohno & Tsunematsu

Work +81 3 6889 7000
Fax +81 3 6889 8000

Ryoichi Mimura

Work +81 3 6889 7175
Nagashima Ohno & Tsunematsu


General Corporate; IP, IT and Entertainment; IP Transactions; IP Litigation; Dispute Resolution


Judge of Tokyo District Court (1989-1993; IP Division, 1989-1991); Judicial Research Official of Supreme Court (IP & Civil Matters; 1993-1998); Presiding Judge of Tokyo District Court (IP Division; 1998-2005); Judge of Intellectual Property High Court (2005-2008); Judge of Tokyo High Court (2008-2009); Admitted to Bar (2009); Partner at Nagashima Ohno & Tsunematsu (2009-Present); Visiting Professor, Waseda Law School (2010-Present)


Japanese, German and English.


Copyright Law Association of Japan, Japan Association of Industrial Property Law and German-Japanese Association of Jurists


The University of Tokyo (LL.B., 1977); The University of Cologne (Germany) (1981-1983)

Japan: Intellectual property

Intellectual property – Independent local firms

Within: Leading individuals

Ryoichi Mimura - Nagashima Ohno & Tsunematsu

Within: Intellectual property – Independent local firms

The practice at Nagashima Ohno & Tsunematsu covers IP litigation and transactional matters and includes three former judges who are actively involved in IP-related work; Masato Tanaka, Kenji Tosaki and Ryoichi Mimura. Mimura successfully represented Ryohin Keikaku in the Tokyo District Court seeking an injunction against Cainz following an alleged violation of the Unfair Competition Prevention Act. The group also counts Nichia and Alcon Research among its key clients.

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Japan: TMT

TMT – Independent local firms

Within: TMT – Independent local firms

The ‘responsive and client-friendly’ team at Nagashima Ohno & Tsunematsu counts traditional media businesses on its client roster including companies involved in system and software development, gaming and telecoms, as well as those involved in emerging and innovative technologies including AI, IoT, fintech, and cybersecurity. The team specialises in the development and management of content and content-related rights including copyrights and publicity rights. Heading the practice are Ryoichi Mimura and IT and M&A expert Soichiro Fujiwara; the latter recently assisted Toyota and JapanTaxi with an agreement for the joint development of app services for taxi operators.

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Legal Developments in Japan

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to
  • Taking control of a Japanese publicly listed company:

    Introductory notes for successfully completing an M&A
  • Yuasa and Hara Business Law News

    Contents of the Issue Law on liability for breach of contract Review on the amendment to the cabinet office order on Corporate Disclosure

    The Minister for Justice, Alan Shatter (“the Minister”), has published the Criminal Justice Bill 2011 (“the Bill”). The main purpose of the Bill is stated to be “…to amend the criminal law to improve certain procedural matters and strengthen Garda investigative powers. The intention is that such improvements will assist in reducing the delays associated with the investigation and prosecution of complex crime, in particular white collar crime.”
  • Japan: New legislative framework for Sukuk

    The new framework passed in May 2011 will provide a solid legal platform for issuing Sukuk Ijarah under Japanese law. NAOKI ISHIKAWA highlights key legal structures and tax treatment in respect of the anticipated Sukuk issuances in Japan.
  • Yakult Bottle Acquired Distinctiveness

    Do you know about Yakult's delicious lactic acid drink which is contained in a small bottle? Yakult's lactic acid drink (hereafter referred to as "Yakult drink") is the most famous lactic acid drink in Japan and today is also being sold in many countries around the world. When you are enjoying Yakult drink, please keep in mind the case mentioned below.
  • Tax: Japan: International Joint Ventures

    Tax on international joint ventures. Country Q&A (Japan).
  • Japan: Recent Developments in Practice and Law

    The successful closing of two Islamic fi nance transactions which was announced in July 2010 by Nomura Holdings have paved a concrete path for Japanese corporations to consider overseas Islamic fi nance markets for their fund raising activities. The fi rst transaction was in Asia for the issuance of Sukuk Ijarah and the second was in the Middle East for the establishment of a Commodity Murabahah facility (Nomura Deals).
  • Renewable energy takes off in Japan

    Like many other countries, Japan has decided to reform its renewable energy (RE) policy, to dramatically increase the use of renewable energy. The core policy mechanism is a feed-in tariff (FIT). This chapter summarises the contemplated Japanese FIT and its practical impact on existing and future investment in this sector, providing an overview of:
  • Licensing - 2010

    Q & A on Licensing in Japan 
  • Law on the Civil Jurisdiction of Japanese Courts over Foreign Countries, etc.

    The Law has been enacted to clarify the scope of application of the civil jurisdiction of Japanese courts over foreign countries, etc., and set exceptions to civil preocedings involving foreign countries, etc., based on the United Nations Convention on the Jurisdictional Immunities of States and their property (UN Convention on Immunities) (see Article 1).